Thread guide for shuttles



Jan. 4,1927. w 3,487

I. SNOW THREAD GUIDE} FOR SIHUTTLESQ Filed May 14, 1925 r/as IN V ENTOR.

Patented Jan. 4%, 1927.

UNITED STATES ISAA Q SNOW, OF LAWRENCE, MASSACHUSETTS.

THREAD GUIDE FOR SHUTTLES! 'Application filed May 14, 1925 Serial No.30,217.

In an automatic loom when the bobbin is I shifted, it is desirable thatat the first pick the yarn should automatically slip under a front guidefinger or hook and it is also desirable that it should slip under a backguide finger or hook. During the second pick, when the shuttle is thrownback, if every thing functions properly, the yarn should slip down intothe .eye of the shuttle over the front of the horn, thence up behind thehorn and in front of the pin. When once in this position it is highlydesirable thatit should stay there.

Ordinarily the horn keeps it in place but at the beginning ofthe secondpick and of every-pick thereafter, there is a period during which theeye of the shuttle is traveling to the selvage edge of the cloth,whenthe yarn has several inches ofslack. During this slack period, thereis a tendency for the yarn to kink, and also some tendency for it todrop and slip out from under the horn and also from under the frontguide finger or hook. WVhen the yarn begins to kink, almost anything mayhappen to it, and occasionally it happens that it slips up and runs overthe top of the shuttle block or guide plate.

When this happens, it is advantageous to have a back guide finger, guardor hook, to keep the yarn from slipping entirely back to the bobbin. Ifthe yarn does slip entirely over the-shuttle eye block and runs over theside of the shuttle, it must break.

My present invention refers particularly to this back guide finger orhook which is so shaped that it allows the yarn to slip down over itsoutside and thence to its inner side, but is so shaped at the front asto accomplish my purpose.

This purpose is to keep the yarn down as near as possible to the axis ofthe bobbin so that it will pull off or run 011' evenly without jerking,and will rethread by passing under the front hook and horn, more easilythan if it was held up high.

In the drawings, Fig. 1 is a plan View of a shuttle with my improvement.

Fig. 2 is an elevation of the shuttle block removed, as viewed from thetop of Fig. 1. V

Fig. 3 is a front elevation of the shuttle block removed from theshuttle. V

Fig. it is a back view of the shuttle block,

Fig. 5 is a diagrammatic view. similar to Fig. 2, showing also therelative position of the bobbin.

, Fig. .6 is a rear view of a modified form.

Fig. 7 is a sideelevation of Fig. 6.

Fig. 8 is a detail of a modification.

.Fig. 9 is a detail of another modification.

Fig. 10 is a detail of another modification.

Fig. 11 is a side elevation similar to Fig. 2 of another modification.

Fig. 12 is a plan view of the nose of Fig. 11.

S is a shuttle of the self-threading type for automatic looms, havingthe usual bobbin chamber 10 for the bobbin B from which the thread A isunwound in the direction of the arrow in Fig. 1. 12 is the threadchamber which extends forward in continuation of bobbin chamber 10, and13 is the delivery passage which extends still further forward from thethreading chamber.

H represents the shuttle eye in the Wood, and this connects with thethreading chamber 12 through the slot 15 cut away from the deliverypassage 13. 8 represents the metal tip of the shuttle.

This eye H is what is known as a left eye, as it is at the left whenlooking towards the tip 8 of the shuttle. I

F represents. a metallic threading block which is set into a recess 4 inthe wood of the shuttle and is shown as fixed therein by means of ascrew 36 which passes through a hole in the wood of the shuttle and ahole in the block, in a well known manner. Preferably there is also atthe bottom of block F, the projection 3t which fits into a recess in thewood of the shuttle.

32 is the horn and 33 the thread pin, both of well known form.

My improvement is more particularly useful in connection with a certaintype of threading block in which there is a thread directing guide plateG which extends from the top thereof and from the top side of theshuttle, down and out at 22 into the threading chamber 12, or that partof the threading chamber which is enclosed in the thread ingbloek'its-elf indicated at 9 in Fig. 1.

In Figs. lYto 5, there is at or near the back a thread retaining guidehook or finger 2,8 which is in extension of the sloping part 22 of guideplateGQ As this together with the part 22 of guide plate G extends inthe same direction and proximate the normal unwinding path of the threadas it unwinds on the first pick of the shuttle in a magazine loom, thatis in the direction ofthe arrow in Fig. 1, it is clear that it will slipinto the part 9 of the threading chamber 12.

This isprovided the axis U.V. of the bobbin B somewhere nearly coincideswith the bottom 10 or axis of the passage 9 as should be the case and asshuttles are ordinarily constructed. 7

It is clear that when once in the passage 9, the unwinding thread willtravel around in the direction of the'arrow as itunwinds from thebobbin, andthere will be very little likelihood of its unthreading eventhere is no overlap locking device such as shown in certain otherpatents.

The guide plate or guide wall G which is shown as beingpart' of orstarting at the top of shuttle block F, extends down in passage 9 aspart of the outside wall of back finger 28 and of front finger 16. Thesefingers are in extension thereof. 7

I prefer to form on the other side of passage 9, that is the sideopposite eye H, a thread rest 40, which preferably slopes down from thefront end 41 to the back end 42.

It also preferably slopes from the side next to the wood or opposite theeye, down towards the eye.

The front finger 16 may be slightly hooked as shown in Figs. 3 and 4, orit may be formed as at 17 in Figs. 6 and 7 that is, extending downstraight. As shown at 17 it may extend forward to a point or may beblunt as at 16. The back edge, of back finger 28 slopes forward, and itsfront edge slopes in a substantially straight line from a point at 23down and back to a point 24 near its tip, and thence forward to the tip25 forming an angular notch.

As shown by the dotted line XY, in Fig. 5, the bottom edge of the frontfinger and of the back finger should be on or slightly above anyprojection of the top edge of thread rest 40 so that the threadwill havea straight passage. As shown in Figs. 2 and 5, there may be a jog or cutat 4A, leaving a slight recess 42. This helps to prevent the thread fromballooning and slipping by the tip 25 of the back finger.

The purpose of the sloopc from 28 to 2st is as shown in F lVhenever theyarn slips out from under the front finger it is desirable that itshould slip down low as shown at Ain Fig. 5, rather than in the dottedline position T for the reason that on the next pick, if it is helddown, it is more likely to slip under front finger 16, and ret-hread. 7

As shown in Figs. 6 and 7, a guide plate may be extended into a frontfinger 17 of tapering form and which extends down straight and into aback finger '51, similar to 28 while a thread rest 54 may extend fromthe front 52 to the back 53 in a straight fiat plane sloping down andin.

On the other hand as shown in Fig. 8 the thread rest (30 may have arecess 61 into which the tip end 62 of the back finger 65 may extend.

As shown in Fig. 9, the thread rest 71 may extend up at 72, a littlebehind the point of back finger 70.

As shown in Fig. 10 the thread rest 81 may project slightly above thetip 83 of back finger 80, such tip 83 extending down into a recess 82which is open at the back.

As shown in Figs. 11 and 12, the front guide finger may be replaced by anose 90 of well known form and the back edge 91 of back guide finger 92may slope down and back instead of down and front.

It is highly desirable that in every type.

the back guide finger should taper from its top such as 23, 55 and 93,to its tip as 25, 56 and 95, so that if a loop forms as at R in Fig. 7,it will slip off the tip and not cause the thread to break.

I claim:

1. The combination in an'automatically threading shuttle having in oneside an eye in the wood, a shuttle block recess, and a passageconnecting the eye with the recess; of a shuttle block fastened in saidrecess having at the top a guide plate which extends down into therecess away from the I eye, and is formed at the front with a guidefinger which extends downward, and at the back with a back guide fingerwhich extends down and has a back edge which slopes forward and a frontedge which slopes in a substantially straight line down and back to apoint near its tip and thence forward forming an angular notch, bothguide fingers be ing in extension of the guide plate.

2. The combination in an automatically threading shuttle having in oneside an eye in the wood, a shuttle block recess, and a pas-- sageconnecting the eye with the recess; of a shuttle block fastened in saidrecess having at the top a guide plate which extends down into therecess away from the eye, and is formed at the front with a guide fingerwhich extends downward, and at the back with a back guide finger whichextends down and has a back edge which slopes forward and a front edgewhich slopes in a substantially straight line down and back to a pointnear its tip and thence forward forming an angular notch, both guidefingers be ing in extension of the guide plate; and a thread rest whichextends up in the recess opposite the eye and which slopes downtherefrom towards the eye, and from the front to the back from below thefront finger to a point just below the lower end of the back finger.

3. The combination in an automatically threading shuttle having in oneside an eye in the wood, a shuttle block recess, and a passageconnecting the eye with the recess; of a shuttle block fastened in saidrecess having at the top a guide plate which extends down into therecess away from the eye, and is forn'ied at the back with a back guidefinger which extends down and has a back edge which slopes forward and afront edge which slopes in a substantially straight line down and backto a point near its tip and thence forward and down in a taper to itstip forming an angular notch, the outer side of said guide finger beingin extension of the guide plate. r

4. The combination in an automatically threading shuttle having in oneside an eye in the wood, a shuttle blockrecess, and a passage connectingthe eye with the recess; of a shuttle block fastened in said recesshaving at the top a guide plate which extends down into the recess awayfrom the eye, and is formed at the back with a back guide finger whichextends down and has a front edge which slopes in a substantiallystraight line down and back to a point near its tip and thence forwardand down in a taper to its tip forming an angular notch,

ISAAC SNOW.

